Frank krupp



f. L; m uw m y (Model.)

F. KRUPP.

LOCK.

180.400,858. PatentedApr. 2, 1889.

UNITED STATES PATENT OFFICE.

FRANK KRUPP, OF NEV ORLEANS, LOUISIANA.

LOCK.

SPECIFICATION farming part of Letters Patent No. 400,858, dated April e,1889.

Application filed September 22, 1888. Serial No. 286,107. (Model.)

To all whom it may concern:

Be it known that I, FRANK KRUPP, a citizen of the United States,residing at New Orleans, in the parish of Orleans and State ofLouisiana, have invented new and useful Improvenlents in Locks, of whichthe following is a speciiication.

I My invention relates to that type of locks in which the retraction ofthe bolt is permit ted by means of a series of slotted tumblers whichare raised by the key and their slots aligned opposite a stud upon thebolt which moves bac i within said slots.

K It is the purpose of my invention to combine with a lock of this classan independent tumbler actuated by an auxiliary key only, whereby one ormore of the lock-tumblers may be lifted by the insertion of said key,and temporarily supported by a pin on the independent tumbler, afterwhich the bolt may be operated by the insertion of the primary key.

It is my purpose also to so construct and combine the parts that thebolt shall not respond to the action of the auxiliary key or bedisturbed thereby, but shall be instantly operated by the primary keyafter the application of the auxiliary key, the former key being'incapable of removal from the lock until the bolt is again thrownforward, after which the lock is incapable of operation through theagency of the primary key until the auxiliary key is again inserted andused.

The invention consists in the several novel features o f constructionand new combinations of parts hereinafter fully set forth, and thenspecifically pointed out and defined in the claims.

In the accompanying drawings, Figure l is a front elevation of the lock.Fig. 2 is a face elevation, the face-plate and part of the tumblersbeing removed. Fig. 3 is a similar view,

the parts being in a different position. Fig.

4 is a vertical transverse section in the plane,

In the said drawings, the reference-numeral l designates thelock-casing, which may be of any suitable form and dimensions. I Iprefer to make it of rectangular form, with a button, 2, at each angleto receive the attachingscrews.

The numeral I denotes the lock-bolt, pro-- vided with the bolt-plate 4,which extends from the bolt-opening nearly to the opposite side wall,and is provided at its rear end with a slot, 5, which, when the bolt isin place, receives a post, G, projecting from the rear wall of thecasing and serving as a support and guide for the bolt-plate. Upon thispost also are pivotally mounted a series of tumblers, 7,

each provided with a spring plate or wire, 8, by

which the free ends of the tumblers are normally thrown downward. In theouter end of each tumbler is formed an open slot, t), of such dimensionsas to admit a stud or stump, l0, projecting' from the outer face of theboltplate. The slots 9 are differently located upon the several tumblersin the ordinary manner, and are aligned by the action of the key whichlifts the tumblers, brings the several slots into register, and retractsthe bolt.

The numeral 12 denotes the lock-spindle, having a trunnion, 13, whichlies in an opening in the rear wall of the lock-casing. Upon the foot ofthis spindle, within the casing, is mounted a cam, 14, provided with aslot, l5, which receives the end of the key. This cam turns under theaction of the key within an opening, IG, in the lower edge of theboltplate, and retracts the bolt. The rotary movement of the spindle islimited by the lugs 17 on opposite sides of the opening which receivesthe trunnion 1S. Upon the outer end of the spindle is mounted thecylindricatbearing or block I8, having a key-slot, 19, registering withthe slot 15. This block is provided with an annular' seat, 20, for thefaceplate 21, which has a cylindrical shell, 22, provided with aninwardly-turned iiange, 23, which rests upon the annular seat 20, and isprovided with a notch, 24.-, to permit the in- IOO either key until itis turned back to the position in which it was first inserted. Thefaceplate is fastened upon the lock-casing by screws 26, or in any othersuitable manner.

Upon the rearward side or face of the boltplate 4L is formed a recess orchamber, 27, within which lies an independent latch-plate, 28, having aslot, 29, at one endJ which receives the post 6, upon which thelatch-plate moves. Projecting from that face of said plate which isadjacent to the lock-plate or at or near the other end of thelatch-plate is a short pin or stud, 30, project-ing through an opening,3l, in the latch-plate and somewhat beyond the outer face of the latter.The opening 3l is formed with a notch or pocket, 32, lying just behindthe stump 10, and of such size as to readily receive the stud 30, whilejust above the plane of the stump and in rear of the notch 32 isashoulder, In the lower edge of the latch-plate 28 is formed an openingor recess, 34, having a shoulder, 35, the construction being such thatthe recessed edge of the latch-plate lies below the edge of the opening1G in the bolt-plate, and in such position that when the auxiliary key,presently to be described, is inserted and turned the cam lat on thelock-spindle will lift the latch-plate 28, raising a pin 30 out of thepocket 3l, and at the vsame time slightly retracting said latch-plate,so as to bring the pin or stud 30 over the shoulder 33, upon which itwill then rest.

Upon the post 6, and lying against the outer face of the bolt-plate, isa latch-tumbler, 3G, having a point or extremity, 37, which normallyprojects somewhat over the stump l0, on which it rests. Below and inrear of the point 37 is formed ashoulder, 38,which, when the bolt isshot, lies immediately behind the stud 30 on the latch-plate, said studlying directly behind the stump l0 of the bolt-plate. Then the parts arein this position, it is evident that the retraction of the bolt isimpossible.

The auxiliary key is shown in Fig. 8. It is provided with a singleprojection, 39,which lies partly in the slot l5 of the cam lll, butprojects outside of said slot a distance about equal to the thickness ofthe latch-tumbler 36. This projection engages with the lower edge of thesaid tumbler and lifts the point 37 off the stump l0, raising it highenough to permit the pin 3l on the latch-plate to rise and pass overtheshoulder 33 of the bolt-plate. At the same moment that the key raisesthe tumbler 3G the cam 14 of the lock-spindle lifts the latch-plate 28and draws it to the rear far enough to place the stud 30 upon.

the shoulder 33 of the bolt-plate. Further movement in this direction isprevented by a shoulder, 40, upon the bolt-plate l, against which thestud 30 abuts as soon as it is fairly seated upon the shoulder 33, andall retraction of the bolt is rendered impossible by the ordinarytumblers, 7, which are not disturbed by the auxiliary key.

The primary key (shown in Fig. 9) is proL vided with the severalchambers 1.1-, required to lift the ordinary tumblers and bring theirseveral slots into alignment opposite the stump. As this is done, thecam let on the spindle retracts the bolt, the stump passing into theslots of the tumblers in the usual way. As the bolt passes to itsrearward limit of motion, the stud 30 on the latchplate meets a secondshoulder, 42, on the tumbler 36by which it is pushed off the shoulder 33and dropped into the notch or pocket 32. As the bolt is subsequentlyshot forward and locked, the edge 43 of the latchtumbler 36 rides oifthe stud and the tumbler drops into its original position, its pointresting upon the stump l0, with the stud 30 between its shoulder 38 andsaid stump. Thus in order to unlock the bolt the primary key must beremoved and the auxiliary key again introduced and operated, since thetumbler 36 falls into position to lock the bolt aga-inst retractionbefore the other tumblers lifted bythe primary key fall into positionbehind the stump on the bolt.

That I claim isl. In a tumbler-lock, the combination,with the lock-bolthaving a recess and provided with an opening having a shoulder arrangedabove and in rear of a notch or pocket lying behind the stump on thebolt, of an indeA pendent latch-plate having a stud or pin lying in saidnotch and projecting beyond the outer face of the bolt, a latch-tumblerprovided with a shoulder lying behind said pin or stud, and alock-spindle having a cam slotted to receive the key, substantially asdescribed.

2. In a tumbler-lock,the combination, with a series of ordinarytumblers, and with a lock-bolt having a stump, of an independentlatch-plate lying in a recess behind the said bolt and provided with apin or stud projecting through a shouldered opening in the bolt andnormally lying behind the stump, a latch-tumbler adjacent to the bolthaving a shoulder lying behind and a point resting upon said pin orstud, a lock-spindle having a cam which lifts and retracts theindependent latch-plate, and a key which raises the latch-tumbler,substantially as described.

3. In a tumbler-lock, the combination, with a lock-bolt having a stumpand guided and supported by a post, G, on the case, of a series ofordinary slotted tumblers, 7, a latchplate, 28, sliding upon said postand having a pin or stud, 30, proj ecting through a notch, 32, formingpart of an opening, 3l, in the bolt, said opening having shoulders 33and 40, a latch-tumbler, 3G, having a point, 37, and a shoulder, 38,lying behind the stud 30, a lock-spindle, l2, having a slotted cam, 14,limited in rotation by lugs 17 on the case,

IIO

tnd provided with a bearing, 1S, lying in a In testimony W'heieo'f Iaffix my Signature in shell, 22, having' 2t notched ange, 23, aupresence of two Witnesses; auxiliary key having' a single projection,39, lying partly in the slot in the cam 14, yand a FRANK KRUPP; 5primary key having shoulders 4l, acting on f the ordinary tumbiers ndhcving a notch, Witliesses': 25, which receives the iiange 23,substantially WV. B. MURPHY; as described. JAS. Sii/LEON Y

